The Fortress of Mimoyecques

About twenty kilometers from the city of Boulogne-sur-Mer, near the hamlet of Mimoyecques, in northern France, lies a once-secret underground Nazi base.
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Abandoned Soviet Camp of Wünsdorf

About 25 miles south of Berlin lies the small town of Wunsdorf, home to about six thousand inhabitants. But less than thirty years ago it had a population of sixty thousand, of which fifty thousand were soldiers of the Red Army. They lived inside one of the biggest military bases in Europe and the biggest […]
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Pamukkale

Pamukkale, meaning "cotton castle" in Turkish, is a natural site in Denizli Province in southwestern Turkey. The city contains hot springs and travertines, terraces of carbonate minerals left by the flowing water.
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Hang Son Doong

Hang Son Doong is a solutional cave in Phong Nha-Kẻ Bàng National Park, Bố Trạch District, Quảng Bình Province, Vietnam. As of 2009 it is the biggest known cave in the world.
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Derweze Crater

The Derweze Crater, also known as the Door to Hell, is a natural gas field in Derweze (also spelled Darvaze, meaning "gate"), Ahal Province, Turkmenistan. The Door to Hell is noted for its natural gas fire which has been burning continuously since it was lit by Soviet petrochemical scientists in 1971.
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Waitomo Glowworm Caves

The Waitomo Glowworm Caves attraction is a cave at Waitomo on the North Island of New Zealand, known for its population of glowworms.
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Derinkuyu Underground City

Derinkuyu Underground City is an ancient multi-level underground city of the Median Empire in the Derinkuyu district in Nevşehir Province, Turkey.
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Kaymakli Underground City

Kaymaklı Underground City is contained within the citadel of Kaymaklı in the Central Anatolia Region of Turkey.
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Özkonak Underground City

Özkonak Underground City is an ancient city built on the northern slopes of Mt. Idis about 14 km northeast of Avanos in Turkey.
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Metro-2

Metro-2 in Moscow, Russia, is the informal name for a purported secret underground metro system which parallels the public Moscow Metro. The system was supposedly built, or at least started, during the time of Joseph Stalin and was codenamed D-6 by the KGB.
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Balaklava Submarine Base

Balaklava at one time worked at the base; even family members could not visit the town of Balaklava without a good reason and proper identification. The base remained operational after the collapse of the Soviet Union in 1991 until 1993 when the decommissioning process started.
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Coober Pedy

Aboriginal people have a long-standing connection with the area. The first European explorer to pass near the site of Coober Pedy was Scottish born John McDouall Stuart in 1858, but the town was not established until after 1915, when opal was discovered by Wille Hutchison.
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